Dynamo-electric machine.



H. A. BALGOMB & A. FRBIER.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED FEB. 1d, 1908. 93 1,556. Patented Aug. 17, 1909.

2 SHEETS-SHEET l.

H. A. BALCOME L A. FREIER.

` DYNAMO ELECTRIC MACHINE.

APPLICATION FILED P21310, 1908.

93 1,556. Patented Aug. 17, 1909.

' 2 SHEETS-SHEET 2.

Uiairiinv `sri'rrns PATENT euries.

HERBERT A. BALCOME AND ANTON FREIER,OF BOSTON, MASSACHUSETTS, ASSIGN ORS TO HOLTZER-CABOT ELECTRIC COMPANY, A CORPORATION OF MASSACHUSETTS.

Dynamo-ELECTRIC MACHINE.

No. 931,556. i

Specification of Letters- Patent.

Patented Aug. 17, 1909.

Application led February 10, 19`08. Serial No. 415,209.

To all whom it may concern:

Be it known that We, HERBERT A. BAL- eoMri and ANTON FRELER, both residing in Boston, in the county of Suffolk and State of Massachusetts, have invented an Improvement in Dynamo Electric Machines, of which the following description, in connection with the accompanying drawings, is a specification, like letters ,on the drawings representing like parts.

The present invention relates to a dynamo electric machine, and is embodied in a novel construction and arrangement especially adapted for use in the manufacture of small motors.

ln accordance with the invention, the motor frame or easing is composed of sheet steel shaped by a drawing process, or otherwise, to form an inelosing case which supports the armature bearings and also the field members and the coils, there being no fastening devices required to hold the parts together. The field is composed of two members each formin one part of an inclosing case and each aving extended portions adapted to support bearing bushings for the armature shaft. Onev of the said members is provided with a shoulder and rfiange which form a receptacle for the field core which is preferably laminated, andthe said member after the insertionbf the field laminas is then bent over to clamp the laminae in place, and also bent outward to form a supporting fiange upon which the other' member is fitted.

Figure l is a side elevation of a motor embodying the invention; Fig. 2 is an end elevation of one member of the field frame with the field lamina; and coils in position before the said member has been completed, to clamp the field laminas in place; Fig. 3 is a similar view of the field member completed; and Fig. 4 is a vertical, longitudinal section of the motor with part of the casing broken away.

The motor casing is made entirely of sheet steel which is shaped preferably by a drawing process, and consists of the member (L which affords the support for one arniature bearing, the field laminaev and the coils, and the member L which forms a' cover or closure to complete the casing, as well as constituting the support for the other armature bearing and the brush holders.

The member a is first made in the shape best indicated by the dotted lines, Fig. 4, having' the cup-shaped portion a2 which terminates in an annular shoulder 0,3 from which extends the annular fiange a4, the shoulder and flange affording a seat or recess forfthe field member which is shown as consisting of the laminas c. The cup a2 is also formed with a tubularv extension a5 which constitutes the support for a bearing bushing d' for the armature shaft A. To facilitate the insertion of the field coils e, the polar extensions c2 are formed at one side only of the pole pieces c3, the two eX- tensions being opposite to each other, as indicated in Figs. 2 and. 3. The coils, after being slipped into place, are heldby means consist of sheets of ber board or similar insulating material, one end of which rests against .the interior surface ofthe field member c, while the other end is supported in notches o5 formed in the sides of the polar extensions c3 of the laminas c.

When the field portion c and coils c have been placed in position, that portion of the flange aAi which projects beyond the eld lannnae (shown in dott-ed lines, Fig. 4) is bent inward and vpressed into position upon the face of the field portion, thus clamping the same securely in position, a portion of .the flange a4 being also bent outward to form a flange a4 (full lines, Fig. 4) which receives and supports the other member of the field frame.' The said other member` is shaped similarly to the member a having a main cup-shaped portion b2 to accommodate the field coils, but being also provided with a cylindrical portion b3 (Fig. l) which contains the commutator and affords a support. for the brush-holders f. Beyond the cylindrical portion b3 is the tubular extension b5 which contains the bushing or other equivalent bearing member for the opposite end of the armature shaft Claims. l

l. A dynamo-,electric machine comprising a sheet steel frame made in two parts, each part being provided with a tubular support for an armature shaft bearing, and with a cylindrical easing portion, one of said parts being provided with an annular recess larger in diameter than the cylindrical casing portion; a field member clamped in said recess tion clam ed by a portion of the wall in saidi between parallel walls thereof and an annu-4 lar shoulder smaller lin diameter than the recess to receive the other part.

2. In a dynamo electric machine, the combination with a field frame member provided with an annular recess formedin a Wall of said frame. member; a laminated field porrecess an provided with polar extremities; coils tting over said polar extremities; anda second frame member having a tight fric,-

tional fit on the frame member above named with said parts respectively; and va. field 4"member held in place by the Walls of said annularrecess, substantially as 'described 4. In @dynamo electric machine, the combination-With a field frame member; of a field-portion having pole-pieces and oppo- :lsitely extended polar extremities; coils support'ed'o said pole pieces; and holdlng devices projecting from the'cnon-extended side of each pole-piece to the side of the framev adjacent to the op osite pole-piece.

In testimony W ereof, We have signed our names to this specification in the presence of twosubscribin 'witnesses H RBERT A. BALCOME. ANTON FREIER. Witnesses: v

JAS. J. MALONEY, M.v E. CovENEY. 

